Headphone



FIG. 1 is a perspective view of a first embodiment of a headphone showing our new design;

FIG. 2 is an enlarged perspective view along the lines 2-2 and 2′-2′ of FIG. 1; and

FIG. 3 is a left side elevational view thereof; and,

FIG. 4 is a rear elevational view thereof.

The broken lines are directed to environment and are for illustrative purpose only; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a headphone, as shown and described. 